Depending on the
switch model, three or five internal hot-swappable are available. A powered
switch should always have more than one operational fan. The switch can operate
with two operational fans and one nonfunctional fan, but the failed fan should
be replaced as soon as possible to avoid a service interruption due to a second
Figure 1. Fan Module for WS-C3850
The WS-C3850 switches require three fans for proper cooling.
Figure 2. Fan Module for Catalyst
WS-C3850-48XS Switch Models
Fan assembly levers
Fan status LED (red/green)
Fan assembly retention latch
Ensure that the
power supplies are inserted correctly to match the corresponding fans. Power
supplies with blue handles correspond to fans with blue handles, and power
supplies with red handles correspond to fans with red handles.
The WS-C3850-48XS switches require five fans for proper cooling.
Observe these guidelines when removing or installing a fan module:
Do not force the fan module into the slot. This can damage the pins on the switch if they are not aligned with the module.
A fan module that is only partially connected to the switch can disrupt the system operation.
The switch supports hot swapping of the fan module. You can remove and replace the module without interrupting normal switch operation.
Only trained and qualified personnel should be
allowed to install, replace, or service this equipment. Statement 1030
Installing a Fan
Pinch the fan
module release handle, and slide the module out.
replace the fan module within 5 minutes to avoid overheating the switch.
Install the fan
module in the fan slot, and firmly push it into the slot, applying pressure to
the end of the module, not the extraction handles. When correctly inserted, the
fan module is flush with the switch rear panel. When the fan is operating, a
green LED is on in the top left corner of the fan.
Do not reach
into a vacant slot when installing or removing a module. Exposed circuitry is
an energy hazard. Statement 206
Figure 3. Installing the Fan
for C3850-48XS switches will depend on the power supply and fans installed.
Ensure that the power supplies are inserted correctly to match the
corresponding fans. Power supplies with blue handles correspond to fans with
blue handles, and power supplies with red handles correspond to fans with red
For power supplies and fans with red handles, airflow is
from the front panel to the rear panel (warm air is ‘pulled out of’ the
For power supplies and fans with blue handles, airflow is
from the rear panel to the front panel (cool air is ‘pushed into’ the switch.)
the fans are inserted correctly to match the corresponding power supplies. Fans
with blue handles correspond to power supplies with blue handles, and fans with
red handles correspond to power supplies with red handles.
Finding the Fan
Module Serial Number
If you contact
Cisco Technical Assistance regarding a fan module, you need to know the fan
module serial number. See the following illustration to find the serial number.